Mandrel-press



UNITED STATES LEONHAED KELLENEERGEE, 0E sr. GALLEN, SWITZERLAND.

MANDREL-PRESS.

Speccation of Letters Patent.

Patented oet. 18,1921.

Application inea April 17, 1920. serial No. 374,673.

T o all 't0/10m t man] concer/ft.'

Be 1t known that I, LEONHAED KELLEN- BERGER, a citizen of the Republic of Switzer-v land, residing at St. Gallen, in the Canton of St. Gallen, Switzerland, have invented ycertain new and useful Improvements in the working piece whereupon, by the appli-V cation of the device'as a spindle-press, any required greater pressure can be exerted and thus much time saved.

The accompanying drawing illustrates the invention by way of example, both Figure 1 and Fig. 2 showing an elevation of the device, the position of certain parts of the lat'- ter figure being, however, varied. Fig. 3 represents a vertical section through Fig. 1.

In carrying out this invention I make provision of a press frame or stand a which at the' front, at b, is formed with a base plate. Adjacent to this base plate is a second plate m serving as a rest for the working piece into or from which the mandrel is pressed or withdrawn respectively. c designates a rack which, instead of cylindrical form as shown, may of course also be of square 0r other section. This rack is slidably mounted in a sleeve el provided with external Screwthreads, and the said sleeve is fashioned at its upper end into a head e serving to receive the pinion f engaging with the teeth of the rack c. The sleeve d is screwed into the correspondingly screw-threaded top pordriving or pressing means is moved downward against the mandrel and working piece (shown in chain-dotted lines, Fig. l).

If, however, it is desired instead of the rack to employ and utilize the spindle feed of the sleeve al, the safety bolt t is removed from its position shown` in Fig. 1 and placed into an opening 7c provided in the head e of the sleeve. The lever g is thereby secured in a horizontal position, Fig, and the sleeve Z is made free to be rotated. That is to sa the rack is now blocked from movement w iile the screw-threaded sleeve is adapted to be used as a press with aV corre-` spondingly more powerful down-pressure.

The base plate b has alongitudinally disposed recess in order to receive two prismatical members Z which, as illustrated in Fig. 2, serve as rests for a shaft y or the like when it is desired to utilize the apparatus as an anvil block. Thus, if the shaft 'y isynot rectilineal, it is merely necessary to slide the two prismatical members Z within the recess in the base plate b and bring them to near a point of the shaft where pressure is to be applied. Subsequent to the adjustment of the shaft y/ into the position shown in Fig. 2 and its straightening by means of the press, the said shaft may be iixed between the ad- `instable points o of a centering device and tested as to its roundness and true running. The centering device may be of any suitable and known construction. ,Howeveiy in the present case the rod n carrying the adjustable points o is arranged at the rear of the frame a in order that provision may be made at the front of the base plate of the necessary opening p for the reception of the corresponding end of the mandrel when the latter is pressed into the working piece or when the mandrel is removed therefrom.

Another improvement consists of the arrangement of two struts g pivoted to the front of the base plate c and adapted to engage a pin 1' secured near the top of the frame a, the purpose being to relieve the'said frame of the strain, that is, of the moment of flexion. If the working piece is of comparatively large size as indicated at :r in Fig. 1, the two struts g must be disengaged from the pin r, this being quickly and easily effected.

It will be understood that instead of mounting the rack within the sleeve, the construction could be reversed in such a man* ner that the said sleeve is caused to move in the rack. Such a modification would not alter the character of this invention.

Having now fully Vdescribed my said invention what I claim and desire to secure by Letters Patent lis:-

1. In an improved mandrel-press, the combination with a stand having a base plate,V of a Vscrew-threaded sleeve the combination with a stand having a base plate, of ascrew-threaded sleeve adjustably screwed into the top portion of the ystand and having an integral extended head, a

rack mounted within the said sleeve, a pinion journaled in the head part of the sleeve and engaging with the teeth of the rack, and a lever connected to the pinion, the said lever, when` turned about a horizontal axis causing the rack and pinion to be operated, and when turned about a vertical axis, being adapted to move the aforesaid sleeve, substantially as and for the purpose set forth.

3. In the herein described mandrel-press, the combination with al stand, of a screwthreaded sleeve adjustably screwed into the top portion of the stand and having an integral extended head provided with an opening, a rack journaled in the said sleeve, a

Vpinion rotatably mounted inf the head part of the sleeve and engaging with the teeth of the rack, means to actuate the pinion and the rack, and means for blocking the movement of the said sleeve and the .rack and pinion respectively, the said means for blocking these movements comprising a bolt adapted, respectively, to be fixed inthe eX- tended top part of the stand and abut against the head of the sleeve, and be removed and inserted into theaforesaid opening in the extension of the sleeve, all substantially as set forth and shown.

4E.V In a mandrel-pressrof the type described, the combination with a stand having a'pin attached near its top end, of a base plate integral with the stand, and struts pivoted to the said base plate and adapted to be brought into engagementwith and out of engagement from the said pin, substantially as and fon the purpose set forth. Y

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LEONHARD KELLENBERGER. Witnesses:

FRANK DIMMKE, yWAMER I-IEILE. 

